๐ Lesson 19
D5
Preparing for ISO 14067 Carbon Footprint Verification
ISO 14067 is a global standard that tells engineers exactly how to measure and report the total greenhouse gas emissions caused by a product โ like a ton of copper concentrate โ from mining through processing.
๐ฏ Learning Objectives
- โ Calculate cradle-to-gate carbon footprint for a blast-to-crushing process using activity-based emission factors
- โ Design a data collection protocol aligned with ISO 14067โs data quality requirements (DQR) for mining operations
- โ Analyze allocation methods (mass, energy, economic) for co-products (e.g., copper and molybdenum) and justify selection per ISO 14067 Clause 7.3
- โ Explain how uncertainty propagation (per ISO/IEC Guide 98-3) applies to emission factor selection and measurement error in blasting energy inputs
- โ Apply ISO 14067 verification checklist items to audit a draft carbon footprint report for a surface mine
๐ Why This Matters
Mining companies face increasing pressure from regulators (e.g., EU CSRD), investors (via CDP and SBTi), and customers (e.g., Appleโs Supplier Clean Energy Program) to verify their product carbon footprints. A single unverified or non-compliant ISO 14067 report can delay green financing, disqualify bids for low-carbon procurement contracts, or trigger regulatory scrutiny. For blasting engineers, this means every kilogram of explosive used, kWh of drill rig energy, and tonne of diesel consumed must be traceable, quantified, and documented to meet verification standards โ turning operational data into auditable evidence.
๐ Core Principles
ISO 14067 rests on four pillars: (1) Life Cycle Assessment (LCA) framework per ISO 14040/44, requiring functional unit definition (e.g., 1 tonne of run-of-mine ore), system boundaries (cradle-to-gate for most mining), and inventory analysis; (2) GHG Protocol Product Standard alignment, especially for Scope 1 & 2 emissions; (3) Data Quality Requirements (DQR) โ mandating documentation of temporal, geographic, technological, and precision representativeness for all input data; (4) Verification readiness โ ensuring records are complete, consistent, traceable, and subject to internal audit before third-party validation. Blasting-specific relevance includes accounting for explosive manufacturing emissions (often 4โ6 kg COโe/kg ANFO), diesel-powered drill fuel, and electricity for pre-splitting or electronic detonators.
๐ Product Carbon Footprint (PCF) Calculation
The core PCF equation sums emissions across life cycle stages, weighted by allocation where needed. For a blasting operation supplying ore to crushing, emissions include explosive production, drilling energy, and transport โ all converted to COโe using standardized GWP values (IPCC AR6). Allocation is required only when multiple products share a process (e.g., bench blasting serves both copper and waste haulage).
๐ก Worked Example
Problem: A surface copper mine blasts 500,000 t of ore monthly. Drilling consumes 120,000 L diesel (emission factor = 2.68 kg COโe/L), explosives used = 850 t ANFO (production EF = 4.2 kg COโe/kg), and grid electricity for detonator charging = 1,200 kWh (grid EF = 0.45 kg COโe/kWh). Calculate PCF per tonne of ore (cradle-to-gate, no allocation needed).
1.
Step 1: Diesel emissions = 120,000 L ร 2.68 kg COโe/L = 321,600 kg COโe
2.
Step 2: ANFO emissions = 850,000 kg ร 4.2 kg COโe/kg = 3,570,000 kg COโe
3.
Step 3: Electricity emissions = 1,200 kWh ร 0.45 kg COโe/kWh = 540 kg COโe
4.
Step 4: Total emissions = 321,600 + 3,570,000 + 540 = 3,892,140 kg COโe = 3,892.14 t COโe
5.
Step 5: PCF = 3,892.14 t COโe รท 500,000 t ore = 0.00778 t COโe/t ore = 7.78 kg COโe/t ore
Answer:
The result is 7.78 kg COโe per tonne of ore, which falls within the typical range of 5โ12 kg COโe/t for open-pit copper blasting (based on ICMM 2022 benchmarking data).
๐๏ธ Real-World Application
At BHPโs Olympic Dam expansion (South Australia), engineers implemented an ISO 14067-aligned carbon accounting system for blast design optimization. By switching from bulk ANFO to emulsion explosives with 12% lower embodied carbon (verified via EPD from Orica), recalibrating drill pattern energy use with real-time telematics, and allocating shared blasting emissions between copper, uranium, and gold using mass-based allocation (per ISO 14067 Annex F), they reduced reported PCF by 0.8 kg COโe/t ore โ enabling inclusion in Rio Tintoโs โLow-Carbon Metalsโ pilot program and meeting EU CBAM Phase 1 reporting thresholds ahead of schedule.
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